package com.sky.interceptor;

import com.sky.constant.JwtClaimsConstant;
import com.sky.context.BaseContext;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author bairimengchang
 * @version 1.0
 * @project sky-take-out
 * @description jwt令牌校验的拦截器（用户端）
 * @date 2024/08/16 14:14:04
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 校验jwt
     * @param request 请求
     * @param response 响应
     * @param handler 处理器
     * @return 校验是否通过 返回 true 表示成功，false 表示失败
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if (!(handler instanceof HandlerMethod)) {
            return true;
        }

        String token = request.getHeader(jwtProperties.getUserTokenName());

        try {
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            //注意不能这样直接强转，会报类型转换异常ClassCastException
            //Long userId = (Long) claims.get(JwtClaimsConstant.USER_ID);
            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
            log.info("当前userId:{}", userId);
            BaseContext.setCurrentId(userId);
            return true;
        } catch (Exception ex) {
            log.info("jwt校验不通过");
            response.setStatus(401);
            return false;
        }
    }
}
